<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">
	

function b(){
	this.l = 10;
}
function a(){
	b.call(this);
};
alert(new a().l);

</script>
</body>
</html>